[JENKINS-75799] PR Review request

[Dmytro Ukhlov]

Hi Team, while looking through the jenkins-core code I found a place where there are 'TODO:' comments saying that it would be nice to simplify the RunMap index implementation. I created a PR doing this. Can I ask you to review it and give me some feedback to see if this is worth pursuing?
https://github.com/jenkinsci/jenkins/pull/10759